regulator: Only apply voltage constraints from consumers that set them

When applying the set_voltage() requests from consumers skip over those
consumers that haven't set anything, otherwise we'll come out with a
maximum voltage of zero.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 7287000595e5..9493f6111a38 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -158,6 +158,13 @@ static int regulator_check_consumers(struct regulator_dev *rdev,
         struct regulator *regulator;
 
         list_for_each_entry(regulator, &rdev->consumer_list, list) {
+                /*
+                 * Assume consumers that didn't say anything are OK
+                 * with anything in the constraint range.
+                 */
+                if (!regulator->min_uV && !regulator->max_uV)
+                        continue;
+
                 if (*max_uV > regulator->max_uV)
                         *max_uV = regulator->max_uV;
                 if (*min_uV < regulator->min_uV)